Using Electro-magnetically Induced Transparency in Photonic Crystal Cavities to Obtain Large Non-linear Effects

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FIG. 1A is a schematic diagram of an EIT system;FIG. 1B is a graph illustrating absorption as a function of ωp when ωc is present; FIG. 1C is a graph illustrating the refractive index as observed by ωp as a function of ωp;FIG. 2 is a schematic diagram of a photonic crystal all-optical switch at 100% resonant linear transmission;
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Inventors
Professor John Joannopoulos
Research Laboratory for Electronics, MIT
External Link (www.rle.mit.edu)
Professor Marin Soljacic
Research Laboratory for Electronics, MIT
External Link (www.rle.mit.edu)
Lene Hau
Harvard Physics Department
External Link (www.physics.harvard.edu)
Managed By
Dave Sossen
MIT Technology Licensing Officer
Patent Protection

Using electro-magnetically induced transparency in photonic crystal cavities to obtain large non-linear effects

US Patent 7,031,585
Publications
Enhancement of nonlinear effects using photonic crystals
Nature Materials , 211 - 219 (2004)

Applications

This invention can be used in nanophotonics, telecommunication, all-optical computing, and quantum computing.

Problem Addressed

All optical signal processing requires devices that are ultrafast and operate at telecommunication power levels. There is a need for optical devices that can fulfill the requirements in size, switching time and operating power of practical integrated optical systems.

Technology

This invention utilizes a solid-state-based electromagnetically induced transparency (EIT) as the non-linear medium in photonic crystal cavities. This increases the non-linear properties of the photonic crystal because EIT is a superb non-linear medium and photonic crystal cavities are optimal structures with respect to maximizing non-linear effects.  Consequently, optical devices designed with this process has unprecedented non-linear sensitivity, with operating power requirements many orders of magnitude smaller than in most non-linear optics devices.

Advantages

  • Improved the performance of nonlinear optical devices such that the corresponding operation powers and switching times are suitable for implementation in realistic, ultrafast integrated optical devices
  • Enables the miniaturization of optical devices without affecting the operating power requirements